# US 2014/0194848 A1 · Medical infusion pump with power source voltage logging and method for logging a power source voltage in a medical infusion pump > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0194848 A1 - Document ID: US20140194848A1 - Status: Published application - Kind: A1 - Application number: 14/174,257 - Filed: 2014-02-06 - Published: 2014-07-10 - Earliest claimed: 2009-09-10 - Assignees: Roche Diagnostics International AG - Applicants: Roche Diagnostics International AG - Inventors: Reto Aeschlimann; Thomas Rufer - Web page: https://patentgrep.com/patent/US20140194848A1 ## CPC - G01R 31/40: Testing power supplies (testing photovoltaic devices H02S50/10) - A61M 5/14244: {adapted to be carried by the patient, e.g. portable on the body} - G01R 31/3644: {Constructional arrangements} - G08B 21/182: {Level alarms, e.g. alarms responsive to variables exceeding a threshold} - H02J 9/061: {for DC powered loads} - A61M 2205/18: with alarm - A61M 2205/8206: battery-operated - G01R 31/396: Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery - Y10T 29/4973: Replacing of defective part - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} - G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A medical infusion pump and a method for logging a power source voltage of a medical infusion pump are disclosed. The medical pump may include a power source, a processor, and a voltage supervisor which responds if a voltage (VDD) drops to a response voltage level which is above a reset voltage level of the processor. When the voltage supervisor responds, the processor start logging the voltage (Vbat) of the power source in a memory, thus generating a voltage log. The memory maintains the logged data when the power supply by the power source is interrupted, thus enabling retrospective analysis of the voltage log. ## Claims ### Claim 1 A method for retrospectively determining a cause of a power supply interruption in a portable device, comprising: monitoring a processor supply voltage (VDD) via a voltage supervisor; responding if the processor supply voltage (VDD) drops to a predetermined response voltage level which is above a reset voltage level of the processor by providing an output signal via the voltage supervisor and logging a power source voltage (Vbat) in a memory to generate a voltage log, and maintaining in the memory logged data when the power supply by the power source is interrupted to enable retrospective analysis of the voltage log; and determining retrospectively the cause of the power supply interruption in the portable device by retrospectively analyzing the voltage log. ### Claim 2 (depends on 1) The method of claim 1 further comprising logging a time stamp via the processor when the voltage supervisor responds. ### Claim 3 (depends on 1) The method of claim 1 further comprising running a clock circuit of the portable device when the power supply is interrupted by a separate power supply or a power supply buffer. ### Claim 4 (depends on 1) The method of claim 1 further comprising: logging, via the processor, a time stamp together with the power source voltage and an event marker, the event marker being indicative for the power supply interruption; and distinguishing a dropping of the portable device from removal of the power source based on the time span of the power supply interruption; indicating removal of the power source when the time span for the power supply interruption is greater than a predetermined time span, and otherwise reflecting the dropping of the portable device. ### Claim 5 (depends on 1) The method of claim 1 further comprising storing a number of logs in the memory of the portable device. ### Claim 6 (depends on 5) The method of claim 5 further comprising storing 2, 5, 10, or 100 logs in the memory of the portable device. ### Claim 7 (depends on 1) The method of claim 1 further comprising: powering up the portable device, running through, via the processor, a self-testing and powering-up routine, the program code of the powering-up routine being part of the general firmware that controls operation of the processor; storing a corresponding power-up entry in the memory of the portable device together with a timestamp after completing the powering-up routine; viewing a battery as having been removed if the time between the beginning of the logging, or the last logged value before voltage VDD has dropped to the reset voltage level is longer than the time required for running through the powering-up routine; and reflecting otherwise that the battery was disconnected because of a dropping of the portable device. ### Claim 8 (depends on 7) The method of claim 7 further comprising delivering insulin to a patient via the portable device, wherein the portable device is an infusion pump. ### Claim 9 (depends on 7) The method of claim 7 further comprising viewing the battery as having been removed when the time between the beginning of the logging, or the last logged value before voltage VDD has dropped to the reset voltage level and the power-up entry is a half-a-second or more. ### Claim 10 (depends on 1) The method of claim 1 further comprising: testing a battery of the portable device during operation of the portable device; and alerting with a tactile alert of the portable device if the battery approaches an end of its lifetime. ### Claim 11 (depends on 10) The method of claim 10 wherein the alerting further comprises alerting at multiple levels of the Vbat for which the VDD is above the response voltage level. ### Claim 12 (depends on 1) The method of claim 1 further comprising: selecting between either a stop mode or a maintenance mode of the portable device; and operating the portable device in either the stop mode or the maintenance mode. ### Claim 13 (depends on 1) The method of claim 1 further comprising: replacing the battery of the portable device during operation of the portable device; and bridging the power supply interruption by an internal buffer of the portable device. ### Claim 14 A method for retrospectively determining a cause of a power supply interruption in a handheld device, comprising: monitoring a processor supply voltage (VDD) via a voltage supervisor; responding if the processor supply voltage (VDD) drops to a predetermined response voltage level which is above a reset voltage level of the processor by providing an output signal via the voltage supervisor and logging a power source voltage (Vbat) in a memory to generate a voltage log, and maintaining in the memory logged data when the power supply by the power source is interrupted to enable retrospective analysis of the voltage log; and determining retrospectively the cause of the power supply interruption in the handheld device by retrospectively analyzing the voltage log. ### Claim 15 (depends on 1) The method of claim 1 further comprising: logging, via the processor, a time stamp together with the power source voltage and an event marker, the event marker being indicative for the preceding power supply interruption; and distinguishing a dropping of the handheld device from removal of the power source based on the time span of the power supply interruption; indicating removal of the power source when the time span for the power supply interruption is greater than a predetermined time span, and otherwise reflecting the dropping of the handheld device. ### Claim 16 (depends on 14) The method of claim 14 further comprising running a clock circuit of the handheld device when the power supply is interrupted by a separate power supply or a power supply buffer. ### Claim 17 (depends on 14) The method of claim 14 further comprising storing a number of logs in the memory of the handheld device. ### Claim 18 (depends on 17) The method of claim 17 further comprising storing 2, 5, 10, or 100 logs in the memory of the handheld device. ### Claim 19 (depends on 14) The method of claim 14 further comprising: powering up the handheld device, running through, via the processor, a self-testing and powering-up routine, the program code of the powering-up routine being part of the general firmware that controls operation of the processor; storing a corresponding power-up entry in the memory of the handheld device together with a timestamp after completing the powering-up routine; viewing a battery as having been removed if the time between the beginning of the logging, or the last logged value before voltage VDD has dropped to the reset voltage level is longer than the time required for running through the powering-up routine; and reflecting otherwise that the battery was disconnected because of a dropping of the handheld device. ### Claim 20 (depends on 19) The method of claim 19 further comprising delivering insulin to a patient via the handheld device, wherein the handheld device is an infusion pump.